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Thread: 73 MFI crossbar return spring install/adjust

  1. #1
    Junior Member
    Join Date
    Jun 2012
    Location
    Austin TX
    Posts
    25

    73 MFI crossbar return spring install/adjust

    Hi

    My crossbar return spring appears to have slipped (arrow), I think it should be on top (star).
    Name:  crossbar_spring.jpg
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    The pivot point of the spring was also previously repositioned by PO (by large washer, pict2)
    Name:  crossbar_spring2.jpg
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    I'd like to either replace, or reposition the current spring and add 1 turn additional to spring to ensure throttle returns to stop.

    In either case I'm not sure how to approach that.

    How do I add 1 turn to spring tension and reposition 'keeper' to top of arm?

    thanks
    Charles

  2. #2
    Member #226 R Gruppe Life Member #147
    Join Date
    Feb 2009
    Location
    Portland, Oregon
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    2,376
    It looks right on the arm, the straight end should go in the hole. You won’t get that extra wind you want, too much tension, it will pop out of the hole.

  3. #3
    Looks like big washer keeps end in place and OEM position is the hole at the 10 O-clock position.

    I'd loosen the hex nut to allow a little extra freedom to adjust the spring, holding the lever arm to keep the shaft from rotating while loosening the nut and then use a piece of wire that has a loop in it to pull ends of spring into their correct positions.
    Paul Abbott
    Early S Member #18
    Weber service specialist
    www.PerformanceOriented.com
    info@PerformanceOriented.com
    530.520.5816

  4. #4
    Junior Member
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    Austin TX
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    OK, thanks
    I suspect washer was used after an extra wind added and pivot pulled from hole.
    I'll leave well-enough alone for now.

    c

  5. #5
    If some one tried to get more spring tension he is trying to solve a problem further up stream.
    Early S Registry member #90
    R Gruppe member #138
    Fort Worth Tx.

  6. #6
    Member #226 R Gruppe Life Member #147
    Join Date
    Feb 2009
    Location
    Portland, Oregon
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    2,376
    Here my 73 with flapper box blade removed.
    Attached Images Attached Images   

  7. #7
    A while back after I purchased my ‘73 T, a shop told me that I was missing this return spring. In their notes they said the missing spring “may or may not effect high idle but recommend installing in the future.” I just installed it and used gled49’s great photos above for reference. I noticed after the installation that there’s not much tension on the spring itself and it feels kind of loose, like there should be some kind of bushing between the spring and the shaft. I checked my ‘72-‘73 spare parts catalog but not seeing anything along the lines of a bushing. If this set up is correct, great. Just seems odd to me. If anyone has any feedback, or can confirm the fact that the spring should be a little lose, I’d be happy to hear it. Based on edmayo’s comment above, I know it shouldn’t be too tight. Thanks.

  8. #8
    I’ve recently changed that return spring and it was very loose and useless at the bottom position (red arrow on first picture). So I put it on top of the arm like the red star on the picture.
    So far so good it is staying in place.

  9. #9
    Senior Member
    Join Date
    Nov 2014
    Location
    New York
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    332
    Mine seems to jump out of the hole every so often. I wonder if I could open it up a bit so that there is less travel left to right when on the shaft, any downside to doing this?

  10. #10
    For what it's worth, I was reviewing some of the engine photos from a Porsche Classic restoration of a 911T a few years ago and found an image which appears to show the spring clipped to the upper edge of the lever, which would add some additional tension to the spring. Think I'll try putting it in that position. Also noting that this is the position that the original poster, crh referenced.

    Name:  spring-placement.jpg
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